Abstract. In this paper, we research the indoor distributed multi-input multi-output (MIMO) system. We propose a method based on channel angular domain information feedback to improve the indoor distributed MIMO system capacity and stability. We elaborate on the theoretical analysis and modelling process of this method. The simulation results show that using angular domain information at the transmitter to construct the channel information matrix according to the antenna selection to optimize the power allocation and making use of the indoor distributed MIMO offers extra spatial degrees of freedom gain and antenna diversity gain. The proposed approach can significantly improve the signal to noise ratio (SNR), system capacity and stability of the system.